Torsion grip contact



. Y April 11, 1939. 2 F, M, CLEMENT 2,154,302

' TORSION GRIP CONTACT Filed Sept. 25, 1937 J21 yen for" 14 1 i'rzeasea': Frank M c'lemeni' Patented Apr. 11, 1939 PATENT OFFICE 1.15m; TORSION GRIP CONTAQT M. Clement, Beloit, wis, assignor to The- Torsion Grip Manufacturing Comp'any,' 0hican, 111,

Application septa-me; :5, 1937, Serial No. 165,663 Claims. (mus-age) This invention relates to electrical contact means of connectors of the general type disclosed in my copending'application No. 53,220 filed December 6, 1935, and to a method of making my improved form of connector, herein described,"

more particular reference being had to a spring metal product such as referred to adapted to be punched and formed from sheet steel or the like. Someof the. objects of my invention. are to provide a stronger and more durable connector according to size and weight; to provide a folded metaiconnector of this sort having a .greater length of necessary fold :or sha ply bent part and hence greater strength; and to provide a better method or process for making such connectors.

This invention isillu'strated by the accompanying drawing, in which: I r

Fig. 1 represents a strip of spring sheet metal stock and a pair of flat blanksflpunched from said strip.

Fig. 2 is at plan of one of the blanks shown in- Fig. 1 'on which the operation 'of'bending over 'and forming the spring contact arms has been performed, the left arm being turned upward,

and the right aim being turned downward.

Fig. 3 1s a somewhat enlarged view ofthe I blank shown in Fig. 2 showing a stage of the next operation which consists in turning the righthalfof the blank upwardly and over against the left half of the blank. I I

Fig. 4 isa-greatly enlargedview of the device of 3 with the folding operation completed and with the contact arms arranged to' form a;socket.

1 mg. 5 is an edgewise new or the device of 4 with the right part bent upwardly and in- '"inl"1g.6.

Fig. 8 is a bottom view of a multiple pronged *radiotubesocket plate with four connectors mounted thereonand showing the apertures for mounting four more such connectors.-

Referrihg to Fig.- l' the sheet spring metal blank'- I. is fed into a punch-press;adapted and operated to formpunchings 2 such; as are shown at the right of this view. V Each of these blanks 2 is generally rectangular and somewhat oblong in shape, with a narrowing connecting part I for theright and iefthalves 2' and 2" respectively as viewed in Fig. 1. so positioned that when the blankis. folded on its mid-.

. dle longitudinal azdslaxthef'fold will come at this point. 7

Each mu: r this bananas cut. awa

nl e lateral longitudinal fold line adjacent the upper left hand corner as at l and 5 so as to provide a leftwardly projecting arm 6 and 1. These arms ultimately cooperate to formand serve as a spring socket 8 to embrace a connectof plug not shown, as will be apparent. 5

f The lower left hand corner of the blank is cut away as at 9 so as to leave the corresponding part II of the right half in a form adapted to serve as a terminal f r connection to a wire conductor (not shown). Jlhis form of blank is ap- 10 Referring to Fig. 3 it will be apparent that when the right half 2' is folded over, on the middle longitudinal axis 2a of the blank, the upper half. of said right blank swings over the arm I of the left half 2" and that as the folding is completed the right a 6 swings around to an upstanding position parallel with and to the left of the original left arm, as appears in Fig. 4.

Referring further to Fig. 4, this folded blank is now ready for bending transversely, near its middle, as at II, to form l3 shown in Fig. 5, a

' further slightly reverse bend at I being desirable, the lower part I! being nearly vertical and the upper part libeing more-inclined.

These terminals I! are adapted to be assembled on perforated socket plates Lamb as shown forth may be altered or omitted without departing from" the spirit of the invention as defined by the following claims.'

I claim: I 1. A torsion grip contact comprising an oblong 40 body of resilient sheet metal having a lateral lon- "gitudinal fold line and forming two leaves in part at least disposed in substantial parallelism and'each lying in a substantial common plane, one leaf having a wire receiving terminal at one end,- and the-opposite'end thereof and the cor-- responding end of the other leaf being formed to jointly constitute a resilient prong receiving socket extending substantially perpendicularly to the parallel portions of the leaves to receive and embrace a contact pin thrust axially into said 2. A two-leaftorsion grip contaift comprising an oblong body of resilient sheet fiietal having a and forming two 86 other leei being formed to Jointly ctitnte e subprone receiving resilient socket xl ilj 'stantially perpendicularly to the parallel norti oi the leaves toreoeiveand embrace a. contact pin tt axially into said socket, said leaves Ming out apart at their socket end and integrally joined at their opposite end along said fold line.

3. The method of no a, contact which consists in die-stamping a. blank from spring sheet-metal, said blank nearly square with e coplanar terminal projecting at one corner and with coplanar arms remote therefrom, one on the outer edge of a half of said blank and the other on the inner edge 0! the complementary half, ben these arms oppositely and nerpem dicular to the plane of said blank and also bending each of said arms somewhat cylindrically to face oppositely on their concave sides, and then bending said blank on its middle axis bordering said halvese to bring" the cylindroconcave faces of said arms opposite and adjacent to each other and thereby forming from the complementary arms 'a, socket adapted to resiliently embrace to terminal rod. o

. 4. The method or making a. contact which consists in didstamping e, blank from spring sheet-metal, said blank nearly come with e coplanar terminal proi acting at one corner and ben these pcsitelr on their nine een with remote therefrom, one on the outer edgeoieoisaid bandtheothei' on inner edge of the complementary hell, oppositely and perpendicular totheplane ofsaicl hlankandalsobendingeach oi said somewhat cylindricelly to face on- 1.=,. r 5 ve sides. then bendingcgid middle: :=-;.1 bordering said halves cylindroconcave laces of said went to each other and thereby cornnlernentery a socket e, to 1 a: rod and together the two rennin e ecent leaves of the to incline the towerd the opposite end of the device. 5. f m3 of, Eng a. contact which cote in -stning a. generally rectangular blank from spring sheet-metal. .said blank being formed with e ioldline and with cut-out indew tures on the two halves respectively, those on one half being on theedse next to the ioldline and those on the other hall! being away i the onite "we device on e rnei transverse ioldline; said indentures being i'ormed to provide two parallel coplanar with said it relation.

with said arms in complementary socket-forming Q 

